When should I start adding nutes to my autoflower?

I got 4 short riders goin in FFOF soil under a 400w hps. They've been goin for 2 weeks and 1 day today. When should I start adding nutes and what kind? I was thinking like Foxfarm bloom whatever since im using FF soil. Ive heard I should wait 2 weeks so like starting now but others have said like a month and idk what do you think? Ill add pics n a sec

I recently got some FF nutes for my Blue mystic autoflowers. They have a feeding schedule on their website, although I'm not sure if it's designed for autoflowers though.